内蒙古龙头山Ag-Pb-Zn多金属矿床成矿模式及找矿模型

The recent years research indicated that middle-south section of Da Hinggan Mountains metallogenic belt has two periods(Hercynian and Yanshanian) characteristics of metallogenesis, as well as the most of ore deposits in the area closely relate to Permian strata. Longtoushan ore deposit discovered in 2004 is an Ag-Pb-Zn polymetallic ore deposit born in Permian and located in the east hillside of the metallogenic belt, which has considerable resources potentials. It has important research value for its good metallogenic location and blank research history. Base on the detail field geology studies, the geology characteristics of "two stages and three kinds of metallogensis" has established. According to further work through geochemistry research including trace element, REE, S, Pb and Sr isotope, as well as petrography, microtemperature measurement, Laser Raman analysis and thermodynamics calculation of fluid inclusion, origin and characteristic of the ore-forming material and fluid has been discussed. And a new technology of single pellet Rb-Sr isochrones has been tried for dating its born time. Bae on above work, study of ore deposit comparison has been carried out, and metallogesis controlling factor and geological prospecting symbol have been summarized. Finally, metallogenic model and prospecting model have been established. According to above, the next step work direction has been proposed. Main achievement of the paper are listed as follow: 1.Longtoushan ore deposit has experienced two metallogenic periods including hot-water sedimentation period and hydrothermal reformation period. There are three kinds of metallizing phase: bedded(or near-bedded) phase, vein-shaped phase and pipe-shaped phase. The mian metallogenic period is hot-water sedimentation period. 2.Ore deposit geochemistry research indicated that the metal sulfides have charcateristic of hot-water sedimentation metallogensis, but generally suffered later hydrothermal transformation. The barite mineral isotope content is homogenous, showing the seabed hot-water sedimentation origin characteristic. Wall rock, such as tuff is one of metallogenic material origins. Both of Pb model age and Rb-Sr isochrone research older age value than that of strata, possibly for been influenced by hydrothermal transformation, and interfusion of ancient basis material. 3.There are two kinds of main metallogenic fluid inclusion in barite of the Longtoushan ore deposit, which are rich gas phase( C type) and liquid phase (D type). Their size is 2～7um, and principal components is H2O. Both kinds of fluid inclusion have freezing point temperature -7.1～-2.4℃ and -5.5～-0.3℃, salinity 4.0～10.6wt% and 0.5～8.5wt%, homogeneous temperature 176.8～361.6℃ and 101.4～279.9℃, which peak value around 270℃ and 170℃, respectively. Density of the ore-forming fluid is 0.73～0.97g/cm3, and metallogenic pressure is 62.3×105～377.9×105Pa. Above characteristic of the fluid inclusion are well geared to that of ore deposit originated in seabed hot-water sedimentation. 4.Through the comparison research, that Longtoushan ore deposit has main characteristic of hot-water sedimentation ore deposit has been indicated. Ore-forming control factor and prospecting symbol of it has been summarized, as well as metallogenic model and prospecting model. Next step work direction about prospecting has also been proposed finally.

胶东昆嵛山复式花岗岩体的演化—岩石学和锆石U-Pb年代学研究

Kunyushan composite granite pluton is located in northeast part of the Sulu UHP collisional belt, Jiaodong peninsula, eastern China. It is regarded as the boundary of the Jiaodong block and the Sulu UHP collisional belt. The body is unique in the Dabieshan-Sulu UHP collisional orogen for its feature of multiple intrusions of diverse types granitoid rocks in a long span after UHP the collision between the North China and the Yangtze plates in late Triassic. It can be grouped into four series on the basis of petrology and petrochemistry. They are mid-K calc-alkaline granitoids, strongly peraluminous granites, high-K calc-alkaline granitoids and syenitic granite of shoshonitic series. In this thesis, the later three types of rocks are investigated geochronologically in detail. The grain zircon U-Pb isotope dilution dating technique has been employed in this study. Zircon morphology are presented and discussion on the chemical and physical conditions of the granite formation have been carried out in addtion. Strongly peraluminous granites comprises foliated monzogranite and garnet bearing leucogranite. They occupy more than half of the area of the Kunyushan composite body. Three zircon samples of foliated monzogranites have been analyzed, they yield lower intercept ages mainly in the range of 140-150 Ma. The formation of these rocks was likely to be at 700-600 ℃, implied by zircon morphology. Two zircon samples of the garnet bearing leucogranite yield lower intercept ages from 130 Ma to 140 Ma. Zircon morphology indicate that the liquidus temperature of the magma was about 750 °C. Syenitic granite of shoshonitic series occur in the north central part of the body, and the volume is quite small contrast to other types. One zircon sample was chosen from this rock, and yield lower intercept age of 121+1.8/-2.1 Ma. Zircon morphology indicate that the liquidus temperature of this rock is up to 900 °C, which is much higher than others'. High-K calc-alkaline granitoids can be divided into two types on the basis of rock texture and structure. One is Kf-porphyritic monzogranite. It's outcrop is quite small. Zircon ages of one sample constrain the emplacement of this rock at about 112 Ma. The other is medium-grain to coarse-grain monzogranite. Zircons from it yield lower intercept age of 100.5+2.9/-4.6 Ma. The variation of zircon morphology suggest that these two monzogranites were outcomes of a single magma at different stage. The former emplaced earlier than the latter. The liquidus temperature of the magma was about 800 ℃ Inherited zircon is ubiquitous in the Kunyushan composite body. Most of the samples yield upper intercept ages of late Proterozoic. It was considered that only the Yangtze plate underwent a crustal growth during late Proterozoic among the two plates which involved into the UHP collision. Inherited zircon of about 200 Ma can also be observed in strongly peraluminous and high-K calc-alkaline granitoids. Two samples out of eight yield upper intercept ages of Achaean.

滇西北中旬松诺含矿斑岩的锆石SHRIMP U-Pb年龄及地质意义

位于义敦岛弧南端的中甸岛弧中广泛发育印支期斑岩及斑岩型和矽卡岩型铜矿床。松诺（或称松诺力赞）复式岩体位于东斑岩带中部，由石英闪长玢岩、黑云石英二长斑岩、闪长玢岩和含矿石英二长斑岩组成，其南部为普朗超大型斑岩铜矿床，北部为地苏嘎铜矿点。本文对含矿石英二长斑岩进行了岩相学和锆石SHRIMPU-Pb定年研究，结果表明所有锆石颗粒自形较好且均发育规则的韵律环带，Th含量为180-854μg／g，U含量为270-709μg／g，Th／U比值为0．77-1．24，为典型岩浆成因锆石。获得了含矿石英二长斑岩的侵位年龄为220．9±3．5Ma（n=9，MSWD=1．6），这与中甸岛弧洋壳俯冲造山作用的时限（210-235Ma）相吻合。

铅－210、钍－228、钚年代学在滇池、洞庭湖和昆明湖环境问题上的应用

笔者在大量的文献调研基础上，试图利用 ~(210)Pb、~(228)Th 等短半衰期的铀系子体确定某些湖泊沉积物的沉积速率及年代，结合 239，240 pu 在我国内陆湖泊的分布规律，以全球 pu 随时间的分布规律探索其测年的可能性，以多核素方法探讨测年结果的可靠性，建立沉积的时间尺度。同时，利用这些核素作示踪研究沉积物表层的生物扰动所造成的混合效应。通过对沉积物垂直方向上物质成份。矿物成份和元素分析，研究沉积环境的演化及近百年工业污染的历史。根据所选湖泊的纬度差别，研究湖泊沉积环境和沉积物类型对所研究的核素方法的影响。本论文是首次利用多核素方法研究我国一些内陆湖泊的环境问题，对在我国继续开展这方面研究具有重要意义。

Effect of Pb Volatilization on Dielectric Properties of 0.77PbMg1/3(Nb0.9Ta0.1)2/3O3-0.23PbTiO3

Lead magnesium niobate-lead titanate (PMN-PT) is an intriguing candidate for applications in many electronic devices such as multi-layer capacitors, electro-mechanical transducers etc. because of its high dielectric constant, low dielectric loss and high strain near the Curie temperature. As an extension of our previous work on Ta-doped PMNT-PT aimed at optimizing the performance and reducing the cost, this paper focuses on the effect of Pb volatilization on the dielectric properties of 0.77Pb(Mg1/3(Nb0.9Ta0.1)2/3)O3-0.23PbTiO3. The dielectric constant and loss of the samples are measured at different frequencies and different temperatures. The phase purity of this compound is determined by X-ray diffraction pattern. It is found that the volatilization during sintering does influence the phase formation and dielectric properties. The best condition is sintering with 0.5 g extra PbO around a 4 g PMNT-PT sample.

Generation of 210 fs laser pulses at 1093 nm by a self-starting mode-locked Yb:GYSO laser

We report the first demonstration, to our knowledge, of the femtosecond laser operation by using a new alloyed Yb:GYSO crystal as the gain medium. With a 5 at. % Yb3+-doped sample and chirped mirrors for dispersion compensation, we obtained pulses as short as 210 fs at the center wavelength of 1093 nm. The average mode-locking power is 300 mW, and the pulse repetition frequency is 80 MHz. (C) 2008 Optical Society of America

博优210的选育、示范与推广

博优210是华南晚籼杂交稻的“高优”组合，1993和1994年通过省区试和大面积试种表证，1995年5月通过广东省品种委员会审定，具国内同类型品种领先水平。其主要技术经济指标：1、米质1级至特2级（达出口标准），精米率75％，正精米率71％；2、两年省区试产量名列第二位和第一位，比对照组合增产1％和2％，大田一般亩产450公斤；高产的552公斤，比主栽组合博优64增产30公斤；3、高抗稻瘟病，中抗白叶枯病，后期较耐低温；4、较早熟，全生育期118天，比主栽组合博优64早2至3天；5、制种容易，一般亩产200公斤。由于综合性状优良，而具有较高的经济效益和社会效益，种1亩博优210可增值219元，另因少施或不施农药，减少环境污染，而具有一定的生态效益。

博优210的选育及相关理论研究

博优210是华南晚籼杂交稻的“高优”组合，1993和1994年通过省区试和大面积试种表证，1995年5月通过广东省品种委员会审定，具国内同类型品种领先水平。其主要技术经济指标：1、米质1级至特2级（达出口标准），精米率75％，正精米率71％；2、两年省区试产量名列第二位和第一位，比对照组合增产1％和2％，大田一般亩产450公斤；高产的552公斤，比主栽组合博优64增产30公斤；3、高抗稻瘟病，中抗白叶枯病，后期较耐低温；4、较早熟，全生育期118天，比主栽组合博优64早2至3天；5、制种容易，一般亩产200公斤。由于综合性状优良，而具有较高的经济效益和社会效益，种1亩博优210可增值219元，另因少施或不施农药，减少环境污染，而具有一定的生态效益。博优210均适宜华南各省晚稻区种植，越南亦大量引进试种。种植面积发展异常迅速，1993年3600亩，1994年10万亩，1995年约90万亩，预计1996年将超过300万亩，行家预测，博优210在“九五”期间必将成为华南晚稻主栽组合。发表在《中国水稻科学》等7篇论文，是杂交稻优质育种和优质高产育种的规律性研究结果，对杂交稻育种具有一定指导意义。成果达国内领先水平。